Electron microscope view of two oat leaf chloroplasts, one showing successive layers of grana in side view, and the other showing grana in face view (disk shape of constituent thylakoid lobes are seen).
Part of oat leaf chloroplast at higher magnification. Grana are seen in side view, revealing profiles of membranes. Thylakoids that interconnect grana are shown, with components of stroma, or ground substance, in which thylakoids lie. The dense…
Tactogram showing the approximate maximum threshold recorded at the fingertips of healthy persons (horizontal line), and examples of two types of threshold elevation (reduction in acuity) at selected frequencies (circles and squares).
Vampyroteuthis infernalis (vampire squid) living in the oxygen-minimum zone of Monterey Bay, California, at depths of 600–900 m (1970–2950 ft). (Photo courtesy of Kim Reisenbichler, Monterey Bay Aquarium Research Institute, Moss Landing, CA)